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Models 175, 177 & 179 True RMS Multimeters
Users Manual
May 2003 Rev. 1, 10/08 © 2003-2008 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
Lifetime Limited Warranty
Each Fluke 20, 70, 80, 170 and 180 Series DMM will be free from defects in material and workmanship for its lifetime. As used herein, “life-time” is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from the date of purchase. This warranty does not cover fuses, disposable batteries, damage from neglect, misuse, contamination, alteration, accident or abnormal conditions of operation or handling, including failures caused by use outside of the product’s specifications, or normal wear and tear of mechanical components. This warranty covers the original purchaser only and is not transferable.
For ten years from the date of purchase, this warranty also covers the LCD. Thereafter, for the lifetime of the DMM, Fluke will replace the LCD for a fee based on then current component acquisition costs.
To establish original ownership and prove date of purchase, please complete and return the registration card accompanying the product, or register your product on http://www.fluke.com. Fluke will, at its option, repair at no charge, replace or refund the purchase price of a defective product purchased through a Fluke authorized sales outlet and at the applicable international price. Fluke reserves the right to charge for importation costs of repair/replacement parts if the product purchased in one country is sent for repair elsewhere.
If the product is defective, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Fluke will pay return transportation for product repaired or replaced in-warranty. Before making any non-warranty re-pair, Fluke will estimate cost and obtain authorization, then invoice you for repair and return transportation.
THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAM-AGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY. AUTHORIZED RESELLERS ARE NOT AUTHORIZED TO EXTEND ANY DIFFERENT WARRANTY ON FLUKE’S BEHALF. Since some states do not allow the exclusion or limita-tion of an implied warranty or of incidental or consequential damages, this limitation of liability may not apply to you. If any provision of this warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.
Fluke Corporation Fluke Europe B.V. P.O. Box 9090 P.O. Box 1186 Everett, WA 98206-9090 5602 BD Eindhoven U.S.A. The Netherlands
Visit the Fluke website at: www.fluke.com Register your Meter at: register.fluke.com
2/02
i
Table of Contents
Title Page Contacting Fluke...................................................................................................................... 1 "Warning" and "Caution" Statements ...................................................................................... 1 Unsafe Voltage ........................................................................................................................ 1 Test Lead Alert ........................................................................................................................ 1 Battery Saver ("Sleep Mode").................................................................................................. 2 Terminals ................................................................................................................................. 2 Rotary Switch Positions ........................................................................................................... 2 Display ..................................................................................................................................... 3 MIN MAX AVG Recording Mode ............................................................................................. 4 Display HOLD and AutoHOLD Modes..................................................................................... 4 YELLOW Button ...................................................................................................................... 4 Display Backlight (Model 177 and 179 Only) .......................................................................... 4 Manual Ranging and Autoranging ........................................................................................... 5 Power-Up Options ................................................................................................................... 5 Making Basic Measurements .................................................................................................. 6
Measuring AC and DC Voltage .......................................................................................... 6 Measuring Resistance ........................................................................................................ 6 Measuring Capacitance...................................................................................................... 6 Testing for Continuity.......................................................................................................... 7 Measuring Temperature (Model 179 Only) ........................................................................ 7 Testing Diodes.................................................................................................................... 7 Measuring AC or DC Current ............................................................................................. 8 Understanding AC Zero Input Behavior of True RMS Meters............................................ 8 Measuring Frequency......................................................................................................... 9
Using the Bar Graph ................................................................................................................ 9 Cleaning................................................................................................................................... 10 Testing the Fuses .................................................................................................................... 10 Replacing the Battery and Fuses ............................................................................................ 10 Specifications........................................................................................................................... 11
ii
XW Warning. Read before using the Meter:
To avoid possible electrical shock or personal injury, follow these guidelines: ⇒ Use the Meter only as specified in this manual or the protection provided by the Meter might be impaired. ⇒ Do not use the Meter or test leads if they appear damaged, or if the Meter is not operating properly. If in doubt, have the
Meter serviced. ⇒ Always use the proper terminals, switch position, and range for measurements. ⇒ Verify the Meter's operation by measuring a known voltage. ⇒ Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and earth
ground. ⇒ Use caution with voltages above 30 V ac rms, 42 V ac peak, or 60 V dc. These voltages pose a shock hazard. ⇒ Replace the battery as soon as the low battery indicator ( b ) appears. ⇒ Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or
capacitance. ⇒ Do not use the Meter around explosive gas or vapor. ⇒ When using the test leads, keep your fingers behind the finger guards. ⇒ Remove test leads from the Meter before opening the Meter case or battery door.
Symbols
B AC (Alternating Current) I Fuse
F DC (Direct Current) P Conforms to European Union directives
F B
DC/AC $ Canadian Standards Association
J Earth ground T Double insulated
W Important Information; see manual ! Underwriters Laboratories, Inc. Meter in accordance with IEC 61010-1. 54CJ
b Battery (Low battery when shown on display.)
; Conforms to relevant Australian standards
s Inspected and licensed by TÜV (Technischer Überwachungs Verein) Product Services
# VDE (Verband Deutscher Electroniker)
1
Models 175, 177 & 179 True RMS Multimeters
The Fluke Model 175, Model 177, and Model 179 are battery-powered, true-RMS multimeters (hereafter "the Meter") with a 6000-count, 3 3/4-digit display and a bar graph. This manual applies to all three models. All figures show the Model 179. These meters meet CAT III and CAT IV IEC 61010 standards. The IEC 61010 safety standard defines four overvoltage categories (CAT I to IV) based on the magnitude of danger from transient impulses. CAT III meters are designed to protect against transients in fixed-equipment installations at the distribution level; CAT IV meters are designed to protect against transients from the primary supply level (overhead or underground utility service). The Meter measures or tests the following: ♦ AC / DC voltage & current ♦ Diodes ♦ Resistance ♦ Continuity ♦ Voltage & current frequency ♦ Capacitance ♦ Temperature (Model 179 only)
Contacting Fluke To contact Fluke, call:
1-888-993-5853 in USA 1-800-363-5853 in Canada +31 402-678-200 in Europe +81-3-3434-0181 in Japan +65-738-5655 in Singapore +1-425-446-5500 from anywhere in the world
Visit Fluke's web site at www.fluke.com. Register your Meter at http://register.fluke.com.
"Warning" and "Caution" Statements A "XW Warning" identifies hazardous conditions and actions that could cause bodily harm or death. A "Caution" identifies conditions and actions that could damage the Meter, the equipment under test, or cause permanent loss of data.
Unsafe Voltage To alert you to the presence of a potentially hazardous voltage, when the Meter detects a voltage ≥30 V or a voltage overload (OL), the Y symbol is displayed.
Test Lead Alert To remind you to check that the test leads are in the correct terminals, LEAd is momentarily displayed when you move the rotary switch to or from the mA or A position.
XW Warning Attempting to make a measurement with a test lead in an incorrect terminal might blow a fuse, damage the Meter, and cause serious personal injury.
Models 175, 177 & 179 Users Manual
2
Battery Saver ("Sleep Mode") The Meter enters the "Sleep mode" and blanks the display if there is no function change or button press for 20 minutes. To disable the Sleep mode, hold down the YELLOW button while turning the Meter on. The Sleep mode is always disabled in the MIN MAX AVG mode and the AutoHOLD mode.
Terminals .
FUSED
V
1
2
3
4
AIK01F.EPS
Item Description 1 Input terminal for AC and DC milliamp measurements to
400 mA and frequency measurements. 2 Input terminal for AC and DC current measurements to
10 A and frequency measurements. 3 Input terminal for voltage, continuity, resistance, diode,
capacitance, frequency, and temperature (Model 179 only) measurements.
4 Common (return) terminal for all measurements.
Rotary Switch Positions Switch
Position Measurement Function
K Hz
AC voltage from 30.0 mV to 1000 V. Frequency from 2 Hz to 99.99 kHz.
L Hz
DC voltage 1 mV to 1000 V. Frequency from 2 Hz to 99.99 kHz.
mL T
DC mV 0.1 mV to 600 mV. Temperature − 40 °C to + 400 °C
− 40 °F to + 752 °F
e E
Ohms from 0.1 Ω to 50 MΩ. Farads from 1 nF to 9999 μF.
R G
Beeper turns on at <25 Ω and turns off at >250 Ω. Diode test. Displays OL above 2.4 V.
FB mA
AC mA from 3.00 mA to 400 mA DC mA from 0.01 mA to 400 mA
Hz Frequency of AC mA 2 Hz to 30 kHz.
F AC A from 0.300 A to 10 A BA DC A from 0.001 A to 10 A
>10.00 display flashes. >20 A, OL is displayed.
Hz Frequency of AC A 2 Hz to 30 kHz. Note: AC voltage and current AC-coupled, true RMS, up to 1 kHz.
True RMS Multimeters Display
3
Display .
8
7
7
5 6
4
3
2
1
1314 15
9
1112
10
AIK02F.EPS
No. Symbol Meaning 1 s Continuity test. 2 O Diode test. 3 K Negative readings. 4 Y Unsafe voltage. Voltage ≥ 30 V, or
voltage overload (OL) 5 h Display HOLD is enabled. Display
freezes present reading. In MIN MAX AVG mode, MIN MAX AVG recording is interrupted.
Ah AutoHOLD is enabled. Display holds present reading until it detects new stable input. Then the Meter beeps and displays new reading.
6 MIN MAX AVG enabled. MAX, MIN, AVG Maximum, minimum, average or
present reading.
No. Symbol Meaning 7 nμ F, °F, °C
mVA, Mke, kHz Measurement units.
8 DC, AC Direct current, alternating current. 9 b Low battery. Replace battery.
10 610000mV All possible ranges. 11 Bar graph Analog display. 12 Auto Range The Meter selects the range with
the best resolution. Manual Range The user selects the range.
13 ± Bar graph polarity. 14 0L The input out of range. 15 LEAd WTest lead alert. Displayed when
the rotary switch is moved to or from the mA or A position.
Error Messages
bAtt Replace the battery immediately.
diSC In the capacitance function, too much electrical charge is present on the capacitor being tested.
EEPr Err
Invalid EEPROM data. Have Meter serviced.
CAL Err
Invalid calibration data. Calibrate Meter.
OPEn Open thermocouple is detected.
Models 175, 177 & 179 Users Manual
4
MIN MAX AVG Recording Mode The MIN MAX AVG recording mode captures the minimum and maximum input values, and calculates a running average of all readings. When a new high or low is detected, the Meter beeps.
Note For DC functions, accuracy is the specified accuracy of the measurement function ± 12 counts for changes longer than 350 ms in duration. For AC functions, accuracy is the specified accuracy of the measurement function ± 40 counts for changes longer than 900 ms in duration.
To use MIN MAX AVG recording: ⇒ Make sure that the Meter is in the desired measurement
function and range. (Autoranging is disabled in the MIN MAX AVG mode.)
⇒ Press MIN MAX to activate MIN MAX AVG mode. and MAX light, and the highest reading detected since entering MIN MAX AVG is displayed.
⇒ Press MIN MAX to step through the low (MIN), average (AVG), and present readings.
⇒ To pause MIN MAX AVG recording without erasing stored values, press HOLD. h is displayed. To resume MIN MAX AVG recording, press HOLD again. h turns off.
⇒ To exit and erase stored readings, press MIN MAX for 1 second or turn the rotary switch.
Display HOLD and AutoHOLD Modes XW Warning
To avoid electric shock, do not use the Display HOLD or AutoHOLD mode to determine if a circuit is live. Unstable or noisy readings will not be captured.
In the Display HOLD mode, the Meter holds the reading on the display. In the AutoHOLD mode, the Meter holds the reading on the display until it detects a new stable reading. Then the Meter beeps and displays the new reading. ⇒ Press HOLD to activate Display HOLD. h lights. ⇒ Press HOLD again to activate AutoHOLD. Ah lights. ⇒ Press HOLD again to resume normal operation. To resume normal operation at any time, press HOLD for 1 second or turn the rotary switch.
YELLOW Button Press the YELLOW button to select alternate measurement functions on a rotary switch setting, e.g., to select DC mA, DC A, Hz, temperature (Model 179 only), capacitance, diode test.
Display Backlight (Model 177 and 179 Only) Press S to toggle the backlight on and off. The backlight automatically turns off after 2 minutes.
True RMS Multimeters Manual Ranging and Autoranging
5
Manual Ranging and Autoranging The Meter has both Manual range and Autorange modes. ⇒ In the Autorange mode, the Meter selects the range with the
best resolution. ⇒ In the Manual Range mode, you override Autorange and select
the range yourself. When you turn the Meter on, it defaults to Autorange and Auto Range is displayed. 1. To enter the Manual Range mode, press RANGE.
Manual Range is displayed. 2. In the Manual Range mode, press RANGE to increment the
range. After the highest range, the Meter wraps to the lowest range.
Note You cannot manually change the range in the MIN MAX AVG, or Display HOLD modes. If you press RANGE while in MIN MAX AVG, or Display HOLD, the Meter beeps twice, indicating an invalid operation, and the range does not change.
3. To exit Manual Range, press RANGE for 1 second or turn the rotary switch. The Meter returns to Autorange and Auto Range is displayed.
Power-Up Options To select a Power-Up Option, hold down the button indicated while turning the Meter from OFF to any switch position. Power-Up Options are cancelled when the Meter is turned OFF.
Button Power-Up Options
AutoHOLD
H
K switch position turns on all LCD segments. L switch position displays the software version number. mL switch position displays the model number.
M Disables beeper. (bEEP)
R Enables "Smoothing" mode. (S---) Dampens display fluctuations of rapidly changing inputs by digital filtering.
B (YELLOW)
Disables automatic power-down ("Sleep mode"). (PoFF) Sleep mode is also disabled while the Meter is in a MIN MAX AVG Recording mode, or the AutoHOLD mode.
S Disables automatic 2-minute backlight timeout. (LoFF) (Model 177 and 179 Only)
Models 175, 177 & 179 Users Manual
6
Making Basic Measurements The figures on the following pages show how to make basic measurements. When connecting the test leads to the circuit or device, connect the common (COM) test lead before connecting the live lead; when removing the test leads, remove the live lead before removing the common test lead.
XW Warning To avoid electric shock, injury, or damage to the Meter, disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance.
Measuring AC and DC Voltage
_+ _+
Volts AC Volts DC Millivolts DC
VV mV
RANGEHOLD MIN MAX RANGEHOLD MIN MAX RANGEHOLD MIN MAX
AIK03F.EPS
Measuring Resistance
RANGEHOLD MIN MAX
AIK04F.EPS
Measuring Capacitance
+ _
+
RANGEHOLD MIN MAX
AIK05F.EPS
True RMS Multimeters Making Basic Measurements
7
Testing for Continuity
RANGEHOLD MIN MAX RANGEHOLD MIN MAX
AIK06F.EPS
Measuring Temperature (Model 179 Only)
RANGEHOLD MIN MAX
80BK-A IntegratedType K DMM
Temperature Probe
Ventor
Pipe
RANGE
AIK10F.EPS
XW Warning: Do not connect 80BK-A to live circuits.
Testing Diodes
+ _ _
Forward Bias
Single Beep+
Reverse Bias
Good Diode Good Diode
_+
Shorted
and
Bad Diode
Open
_
CAT
+
Bad Diode
RANGEHOLD MIN MAX RANGEHOLD MIN MAX
RANGEHOLD MIN MAX RANGEHOLD MIN MAX
AIK07F.EPS
Models 175, 177 & 179 Users Manual
8
Measuring AC or DC Current XW Warning
To avoid personal injury or damage to the Meter: • Never attempt to make an in-circuit current
measurement when the open-circuit potential to earth is >1000 V.
• Check the Meter's fuses before testing. (See “Testing the Fuses”.)
• Use the proper terminals, switch position, and range for your measurement.
• Never place the probes in parallel with a circuit or component when the leads are plugged into the current terminals.
Turn power OFF, break circuit, insert Meter in series, turn power on.
CAT CAT
+
+
RANGEHOLD MIN MAX
mA
A
DC
AIK08F.EPS
Understanding AC Zero Input Behavior of True RMS Meters Unlike averaging meters, which can accurately measure only pure sinewaves, True RMS meters accurately measure distorted waveforms. Calculating True RMS converters require a certain level of input voltage to make a measurement. This is why AC voltage and current ranges are specified from 5% of range to 100% of range. Non-zero digits that are displayed on a True RMS meter when the test leads are open or are shorted are normal. They do not affect the specified AC accuracy above 5% of range. Unspecified input levels on the lowest ranges are: • AC voltage: below 5% of 600 mV AC, or 30 mV AC • AC current: below 5% of 60 mA AC, or 3 mA AC
True RMS Multimeters Using the Bar Graph
9
Measuring Frequency XW Warning
To avoid electrical shock, disregard the bar graph for frequencies > 1 kHz. If the frequency of the measured signal is > 1 kHz, the bar graph is unspecified.
The Meter measures the frequency of a signal. The trigger level is 0 V, 0 A AC for all ranges.
+
RANGEHOLD MIN MAX Hz RANGEHOLD MIN MAX
V
V
AC/DC Voltage Frequency AC Current Frequency
Hzx 2
+
mA
A
AIK09F.EPS
⇒ To exit frequency, press YELLOW button or turn the rotary switch.
⇒ In frequency, the bar graph shows the AC/DC voltage or AC current accurately up to 1 kHz.
⇒ Select progressively lower ranges using manual ranging for a stable reading.
Using the Bar Graph The bar graph is like the needle on an analog Meter. It has an overload indicator (>) to the right and a polarity indicator (±) to the left. Because the bar graph updates about 40 times per second, which is 10 times faster than the digital display, the bar graph is useful for making peak and null adjustments and for observing rapidly changing inputs. The bar graph is disabled when measuring capacitance or temperature. In frequency, the bar graph accurately indicates the voltage or current up to 1 kHz. The number of lit segments indicates the measured value and is relative to the full-scale value of the selected range. In the 60 V range, for example (see below), the major divisions on the scale represent 0, 15, 30, 45, and 60 V. An input of −30 V lights the negative sign and the segments up to the middle of the scale.
AIK11F.EPS
Models 175, 177 & 179 Users Manual
10
Cleaning Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings.
Testing the Fuses XW Warning
To avoid electrical shock or injury, remove the test leads and any input signals before replacing the fuse.
Test fuses as shown below.
11 A 440 mA
Ω <.5Ω<12 OKOK
OKOKRANGEHOLD MIN MAX
V
AIK12F.EPS
Replacing the Battery and Fuses XW Warning
To avoid shock, injury, or damage to the Meter: • Use ONLY fuses with the amperage, interrupt,
voltage, and speed ratings specified. • Replace the battery as soon as the low battery
indicator (b) appears.
I b
F2
F1
B1
AIK13F.EPS
F1 Fuse, 440 mA, 1000 V, FAST Fluke PN 943121 F2 Fuse, 11 A, 1000 V, FAST Fluke PN 803293 B1 Battery, 9 V Alkaline NEDA 1604 / 1604A
Fluke PN 614487
True RMS Multimeters Specifications
11
Specifications
Accuracy is specified for 1 yr after calibration, at operating temperatures of 18 °C to 28 °C, with relative humidity at 0 % to 90 %. Accuracy specifications take the form of: ± ( [ % of Reading ] + [ Counts ] ) Maximum voltage between any terminal and earth ground: 1000 V DC or AC RMS Surge Protection: 8 kV peak per IEC 61010 W Fuse for mA inputs: W Fuse for A input:
440 mA, 1000 V FAST Fuse 11 A, 1000 V FAST Fuse
Display: Digital: 6000 counts, updates 4/sec Bar Graph: 33 segments; Updates 40/sec Frequency: 10,000 counts Capacitance: 1,000 counts
Altitude: Operating: 2000 m; Storage: 12,000 m Temperature: Operating: −10 °C to +50 °C;
Storage: −40 °C to +60 °C Temperature coefficient: 0.1 X (specified accuracy / °C
(< 18 °C or > 28 °C) Electromagnetic Compatibility (EN 61326-1:1997):
In an RF field of 3 V/M, accuracy = specified accuracy except in temperature: specified accuracy ± 5 °C (9 °F)
Relative Humidity: Maximum Noncondensing 90 % to 35 °C 75 % to 40 °C 45 % to 50 °C
Battery Life: Alkaline: 400 hrs typical Size (H x W x L): 4.3 cm x 9 cm x 18.5 cm Weight: 420 g Safety Compliances: ANSI/ISA S82.02.01, CSA C22.2-1010.1, IEC 61010 to 1000 V Measurement Category III, 600 V Measurement
Category IV Certifications: CSA, TÜV (EN61010), UL, P, ;, VDE
Models 175, 177 & 179 Users Manual
12
Accuracy ±( [ % of Reading ] + [ Counts ] ) Function Range 1 Resolution Model 175 Model 177 Model 179
AC Volts 2, 3 600.0 mV 6.000 V 60.00 V 600.0 V 1000 V
0.1 mV 0.001 V 0.01 V 0.1 V 1 V
1.0 % + 3 (45 Hz to 500 Hz) 2.0 % + 3 (500 Hz to 1 kHz)
1.0 % + 3 (45 Hz to 500 Hz) 2.0 % + 3 (500 Hz to 1 kHz)
1.0 % + 3 (45 Hz to 500 Hz) 2.0 % + 3 (500 Hz to 1 kHz)
DC mV 600.0 mV 0.1 mV 0.15 % + 2 0.09 % + 2 0.09 % + 2 DC Volts 6.000 V
60.00 V 600.0 V
0.001 V 0.01 V 0.1 V
0.15 % + 2 0.09 % + 2 0.09 % + 2
1000 V 1 V 0.15 % + 2 0.15 % + 2 0.15 % + 2 Continuity 600 Ω 1 Ω Meter beeps at < 25 Ω, beeper turns off at > 250 Ω; detects opens or shorts of 250 μs or
longer. Ohms
600.0 Ω 6.000 kΩ 60.00 kΩ 600.0 kΩ 6.000 MΩ 50.00 MΩ
0.1 Ω 0.001 kΩ 0.01 kΩ 0.1 kΩ 0.001 MΩ 0.01 MΩ
0.9 % + 2 0.9 % + 1 0.9 % + 1 0.9 % + 1 0.9 % + 1 1.5 % + 3
0.9 % + 2 0.9 % + 1 0.9 % + 1 0.9 % + 1 0.9 % + 1 1.5 % + 3
0.9 % + 2 0.9 % + 1 0.9 % + 1 0.9 % + 1 0.9 % + 1 1.5 % + 3
Diode test 2.400 V 0.001 V 1 % + 2 Capacitance
1000 nF 10.00 μF 100.0 μF 9999 μF 4
1 nF 0.01 μF 0.1 μF 1 μF
1.2 % + 2 1.2 % + 2 1.2 % + 2 10 % typical
1.2 % + 2 1.2 % + 2 1.2 % + 2 10 % typical
1.2 % + 2 1.2 % + 2 1.2 % + 2 10 % typical
AC Amps 5
(True RMS) (45 Hz to 1 kHz)
60.00 mA 400.0 mA6 6.000 A 10.00 A7
0.01 mA 0.1 mA 0.001 A 0.01 A
1.5 % + 3 1.5 % + 3 1.5 % + 3
1. All AC voltage and AC current ranges are specified from 5 % of range to 100 % of range. 2. Crest factor of ≤ 3 at full scale up to 500 V, decreasing linearly to crest factor ≤ 1.5 at 1000 V. 3. For non-sinusoidal waveforms, add -(2% reading + 2% full scale) typical, for crest factors up to 3. 4. In the 9999 μF range for measurements to 1000 μF, the measurement accuracy is 1.2 % + 2 for all models. 5. Amps input burden voltage (typical): 400 mA input 2 mV/mA, 10 A input 37 mV/A. 6. 400.0 mA accuracy specified up to 600 mA overload. 7. > 10A unspecified.
True RMS Multimeters Specifications
13
Accuracy ±( [ % of Reading ] + [ Counts ] ) Function Range 1 Resolution Model 175 Model 177 Model 179
DC Amps4 60.00 mA 400.0 mA6 6.000 A 10.00 A7
0.01 mA 0.1 mA 0.001 A 0.01 A
1.0 % + 3 1.0 % + 3 1.0 % + 3
Hz (AC- or DC- coupled, V or A 2, 3 input )
99.99 Hz 999.9 Hz 9.999 kHz 99.99 kHz
0.01 Hz 0.1 Hz 0.001 kHz 0.01 kHz
0.1 % + 1 0.1 % + 1 0.1 % + 1
Temperature -40 °C to +400 °C -40 °F to +752 °F
0.1 °C 0.1 °F NA NA 1 % + 105
1 % + 185 MIN MAX AVG For DC functions, accuracy is the specified accuracy of the measurement function ±12 counts for changes longer than 350 ms in
duration. For AC functions, accuracy is the specified accuracy of the measurement function ±40 counts for changes longer than 900 ms in duration.
1. All AC voltage and AC current ranges are specified from 5 % of range to 100 % of range. 2. Frequency is specified from 2 Hz to 99.99 kHz in Volts and from 2 Hz to 30 kHz in Amps. 3. Below 2 Hz, the display shows zero Hz. 4. Amps input burden voltage (typical): 400 mA input 2 mV/A, 10 A input 37 mV/A. 5. Does not include error of the thermocouple probe. 6. 400.0 mA accuracy specified up to 600 mA overload. 7. > 10A unspecified.
Models 175, 177 & 179 Users Manual
14
Function Overload Protection 1 Input Impedance (Nominal)
Common Mode Rejection Ratio (1 kΩ Unbalanced) Normal Mode Rejection
Volts AC 1000 V RMS > 10 MΩ < 100 pF > 60 dB @ DC, 50 Hz or 60 Hz Volts DC 1000 V RMS > 10 MΩ < 100 pF >120 dB @ DC, 50 Hz or 60 Hz > 60 dB @ 50 Hz or 60 Hz mV/T 1000 V RMS2 > 10 MΩ < 100 pF >120 dB @ DC, 50 Hz or 60 Hz > 60 dB @ 50 Hz or 60 Hz
Full Scale Voltage To: Open Circuit Test Voltage 600 kΩ 50 MΩ
Short Circuit Current
Ohms/Capacitance 1000 V RMS2 < 8.0 V DC < 660 mV DC < 4.6 V DC < 1.1 mA
Continuity/Diode test 1000 V RMS2 < 8.0 V DC 2.4 V DC < 1.1 mA
1. 10 7 V-Hz maximum.
2. For circuits < 0.3 A short circuit. 660 V for high energy circuits.
Function Overload Protection Overload mA Fused, 44/100 A, 1000 V FAST Fuse 600 mA overload for 2 minutes maximum, 10
minutes rest minimum A Fused, 11 A, 1000 V FAST Fuse 20 A overload for 30 seconds maximum, 10
minutes rest minimum
